<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>HR</title>
</head>
<body>

    <hr color="#00ff00" >
    <hr color="yelle" >
    <hr color="red" >

    <hr color="red" width="50%" >
    <hr color="red" width="300px" >
    
    
    <!-- align 靠那边 -->
    <hr color="#fff000" width="300px" align="left" >
    
    <hr color="#fff000" width="300px" align="right" >
    
    
    <hr noshade = "noshade" >



    <!-- noshade 取消阴影 -->

    
</body>
</html>